Uniformity of particle size is important for the operation
of the gasifier. Unlike the updraft gasifier types (counter-current) are not
too sensitive to the particle size of the raw material, the type downdraft
gasifier (co-current) have a particle size uniformity requirement of raw
material that more stringent. Pelleting and
briquetting is an attempt to obtain uniformity of particle sizes of raw
materials, improvement of the quality of raw materials, and transportation
savings. Materials such as sawdust, forest waste and empty fruit bunches of oil
potential for compressed into pellets or briquettes.
Downdraft gasifier (co-current) will produce a cleaner gas
from tar so that subsequent gas cleaning will be easier to do, to then be used
as heating fuel, gasoline engines, diesel engines (dual fuel), or a gas engine
to generate electricity. Updraft gasifier produces gas from too much dirty tar
so that the gas cleaning more difficult and therefore its application mainly to
the heat source. Downdraft gasifier applications so that wider and more widely
used in a number of industries.
The production of briquettes or pellets should be done as
close as possible to the raw material (raw material oriented) for technical and
economic reasons, and then the product of wood pellets and briquettes can be
transported to the gasifier unit location within a specified radius. Special
briquettes, just type screw (extruder) are suitable for the gasification
process. Gasifier product in the form of heat energy, mechanical energy, and
electrical energy can directly be used by the user so that the orientation of
the gasifier unit is approaching the user or market (market oriented).
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